Question 189
If $$A = \begin{bmatrix} 1 & -1 \\ 2 & -1 \end{bmatrix}, B = \begin{bmatrix} a & 1 \\ b & -1 \end{bmatrix}$$ and $$(A+B)^{2} = A^{2} + B^{2}$$ , then a + b =
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